Abstract The usE of blue green algae Spiru/ina in aquaculture has several potential advantages over the
pr oduction of fish. This study was designed to investigate the ef feet of different replacement levels of
fishmeal with Sprrulina on weight gain and Survival rate of common carp Cyprmus carpio L., the trail was
conducted for 105 days and for this purpose 200 fingerlings common carp with an average weight 32.7 g
were brought from a local market. The fish were acclimated to laboratory conditions and fed with control
pellets (32% pr otein) prior to the feeding trials for 21 days. Five experimental diets were used and Spiru/ina
replaced fishmeal protein from the standard diet at O (T1), 5 (T2), 10 (T3), 15 (T4) and 20% (T5) levels.
Analysis of variance for weight gain at this period showed that fish group fed 10% Spiru/ina (T3) had a
significant (p« 0.05) higher body weight as compared with the conlr ol ones and other replacements. From
the data observed (T2) and (T4) have the higher survival rate and all treatments had slgmfrcant (p« 0.05)
difference compar e to control (T1). No significant differences were observed in all sensitive composition
except color in which T2 was higher significantly than others. The percent of protein and lipids increased
significantly in T3 and T5.